diff --git a/pyproject.toml b/pyproject.toml
index 1ffae4a..880a9e9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -55,7 +55,7 @@ dependencies = [ # Optional
 [project.optional-dependencies] # Optional
 dev = ["black", "ruff", "isort"]
 test = ["pytest", "pytest-cov", "pytest-sugar", "pytest-xdist"]
-doc = ["myst-parser", "sphinx-copybutton","sphinx-gallery","sphinx-book-theme"]
+doc = ["myst-parser", "sphinx-copybutton","sphinx-gallery","sphinx-book-theme" "matplotlib", "pysap-fmri", "ipywidgets"]
 toolkit = [ "matplotlib", "pysap-fmri"]
 # List URLs that are relevant to your project
 # This field corresponds to the "Project-URL" and "Home-Page" metadata fields: